They've also got an "all-ages comics" sale which ends tonight, with 99¢-and-up issues of the likes of Archie, Bone, and presumably less-adult-themed supers. A few of these issues are free, including the first issue (not the first omnibus volume, which is $5) of Bone. If you have pre-reading-age kids, or just appreciate a good kids' book, take a look at Owly.

A bit OT, but for those of you that regularly buy books from these guys is there a way to back up your stuff like you can with an eBook?

I'm looking at their TOS and it seems to me that if they lose their deal with a publisher then you could be out of luck as far as reading stuff you've paid for (bolds are mine)...

Quote:

Digital Content:
The Service enables you to download, display and use comic books and other digitized electronic content as made available by comiXology from time to time (individually and collectively, "Digital Content"). Upon your payment of the applicable fees (if any) and subject to any further restrictions in the EULA, if applicable, comiXology grants you the non-exclusive right to view, use and display the Digital Content as part of your use of the Service and solely for your personal, non-commercial use. Digital Content is licensed, not sold, to you by comiXology. ComiXology reserves the right to revoke your license to Digital Content at any time for any reason. Unless specifically indicated otherwise, you may not sell, rent, lease, distribute, broadcast, sublicense or otherwise assign any rights to the Digital Content or any portion of it to any third party, and you may not remove any proprietary notices or labels on the Digital Content. In addition, you may not, and you will not encourage, assist or authorize any other person to, bypass, modify, defeat or circumvent security features that protect the Digital Content. You acknowledge and agree that Digital Content may not be available to view, use or display under certain conditions, such as due to restrictions made by licensors of Digital Content or if the publisher of Digital Content no longer retains the rights or other licenses, consents or permissions to that Digital Content. ComiXology reserves the right to modify or discontinue the offering of any Digital Content at any time. If a unit of Digital Content becomes unavailable prior to download but after purchase, your sole and exclusive remedy is the refund of the purchase price paid for such Digital Content.

With stuff from 2000AD you get a PDF and CBZ copy which means you'll have access even if the publisher or distributor go under. Any way to get stuff from other publishers that way?

I've stayed away from digital comics except for freebies so far because there doesn't appear to be a way to ensure I'll have access to my content in the future if I want to re-read something (also I think a lot of prices are too high, but that's a different issue).